1. The hairy crab on the pliers is called Eriocheir sinensis. Eriocheir sinensis is a crustacean of Eriocheir sinensis, also known as Eriocheir sinensis, hairy crab, hairy crab and freshwater crab. It is a traditional aquatic treasure in China, and its feet are covered with fluff. Like other higher animals, the internal organs of Eriocheir sinensis have been fully developed, with relatively complete digestive, respiratory, circulatory, nervous and reproductive systems.

2. After a long period of evolution, the head and chest of Eriocheir sinensis have been completely integrated, and the chest is the main part of Eriocheir sinensis, which consists of the breastplate of the head and the abdominal nail. The head, chest and back are covered with a layer of hard carapace, which is called the head and chest armor, commonly known as crab bucket. The carapace is generally dark green and sometimes ochre yellow, which is the adjustment function of Eriocheir sinensis for self-protection and adaptation to the environment. The surface of the crustacean is wavy, forming many areas, which are consistent with the position of internal organs, and are divided into six areas: stomach area, heart area, left and right liver area and left and right gill area. The edge of the crustacean can be divided into five parts: front edge, eye edge, front edge, back edge and back edge. The center of the leading edge is the forehead with four dentate processes, which are called frontal teeth. The depression in the middle of the front teeth is the deepest one in the middle. There are four sharp teeth on the left and right front side edges, which are called side teeth. The posterior edge of the carapace inclines inward, and the posterior edge is relatively straight at the junction with the abdomen.